Rubie's Official Ladies Supergirl Dress

I'm a 12 on top 14 on bottom which size should I get? As there is only 10 to 12 or 14 to 16

Not sure on what size to get, i'm 5ft 6 and a size 10. any help would be appreciated?

What size should i get for my wife? Shes 5'2 size 10-12. Boobs are 32b lol